Handsaw.



J. WOOD. HANDSAW. APPLICATION FILED 9110.27, 1910.

999,61 7; Patehted Aug. 1,1911.

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UNITE.

STATES ATENT critics.

JOSEPH WOOD, OF EVERETT, MASSACHUSETTS, ASSIGNOR, BY MESNE ASSIGNMENTS, OF ONE-HALF T0 MARGARET A. WOOD, OF EVERETT, MASSACHUSETTS.

HANDSAW.

To all whom it may concern:

Be it known that I, JOSEPH 7000, of Everett, in the county of Middlesex and State of Massachusetts, have invented certain new and useful linprovements in Hand: saws, of which the following is a specification.

This invention relates particularly: to

meat saws employed by butchers, the saw comprising a resilient frame and a blade which-is detachable from the frame and is held in engagement therewith by the resilience of the frame, the blade being discngageable from the frame by the springing of the frame from its normal shape.

The invention has for its object to pro vide a simple and durable saw of this character, the frame of which is adapted to be sprung to release the saw from the frame and permit its application to the frame, by a lever fulcrumed on the blade and having a bearing on the frame, the construction being such that the same lever may be used to disconnect the blade from the frame and engage it with the frame.

The invention consists in the improvements which I will now proceed to describe and claim.

Of the accompanying draw'ings,-Figure 1 represents a side elevation of a saw embodying my invention. Fig. 2 represents an elevation of the .outer end of the saw. Fig. 3 represents an enlargement of a portion of Fig. 1 showing the lever engaged with the frame and blade preparatory to the removal of the blade from the frame. Fig.

' 4 represents a View similar to Fig. 3 showing the lever engaged with the frame and blade preparatory to the engagement of the blade with the frame. Fig. 5 represents a perspective view of the lever shown by Figs. 3 and 4.

The same reference characters indicate the same or similar parts wherever they ocour in the figures.

The frame of my improved saw is composed of a back 12, an inner arm 13, and an outer arm 14, said back and arms being preferably made in a single-part of tempered steel, the arms normally standing at a predetermined distance apart and beingadapted to be moved slightly toward each other by a springing of theframe' due to pressure tending to force the arms inwardly from their normal ositions.

"16 th lade whi h isprovided Specification of Letters Patent.

Application filed December 27, 1910. Serial No. 599,243.

of the slot.

Patented Aug. 1, 1911.

at its end portions with coupling members which are preferably studs 16,. and 17, projecting from opposite sides of the blade. The frame arms 13 and 14 are provided with slots 18 in their outer end portions adapted to receive the end portions of the blade 15. In the branches of the frame arms formed by said slots are complemental coupling members 19 and 20 formed to engage the blade coupling members 16 and 17, the coupling members 19 and 20 being recesses formed .in the outer edges of said arms as shown by Fig. 1. Then the frame and blade are operatively connected, as shown by Fig. 1, the resilience of the frame causes the coupling members 19 and 20 to exert pressure in opposite directions on the coupling members 16 and 17, the latter entering the former and thus holding the blade in positivelyinterlocked engagement with the frame.

The studs, constituting the coupling members, are elongated, as shown by Fig. 2, so that they project outwardly from opposite sides of the arm 14- and constitute collectively. a fulcrum for a lever 21 which is employed forv the purpose of springing the frame arms toward each other for the purpose of removing and applying the blade, as hereinafterdescribed. The said lever has a curved body in which is formed a longitudinal slot 22, which is widened by recesses 23, formed between the ends The ends of said recesses are oppositely inclined and form cam-shaped shoulders 24 and 25. The outwardly curved side of the lever at one end of the slot 22 is adapted to hear on the outer edge of the arm 14, said ouger edge being hereinafter referred to as th lever seat which faces outwardly and is located above the coupling reccss 20 in said arm. The end of theslot adjacent'to the portion of the lever which bears on said lever seat is preferably in'- clined to form a tooth 26 adapted to engage either of two notches 27 and 28 formed in said lever seat, said notches being at differ ent distances from the coupling recess 20.

The relative positions of the tooth 26 and the inclined shoulders 24.- and 25 are suchthat, when the tooth 26 engages the inner notch-27, the inclined shoulders 24.- bear on the studs l'i j fls shown by Fig. 3, It will now 'besee'n' that, when the lever is applied, as shown by Fig. 3, and is moved in the y direction indicated by the arrow in, the studs bers of the frame.

direction.

direction indicated by the arrow y, pressure being at the same time exerted through the blade 15on the innerarm 13 in the opposlte sprung toward each other sufliciently to per mit the disengagement of the coupling memhereof the blade from the couplingmem- In engaging the blade with the frame, the coupling members 16 are firstengag'ed with the coupling members 19 and the tooth 26 of the lever is engaged with the outernotch 28, as shown by Fig. 4, the inclined shoulders 25 at the same time bearing on the studs 17. Pressure on the lever in the direction of the arrow as will again cause a springing of the frame sufiicient to permit the studs 17 y to pass upwardlyinto engagement with the recesses or couplingmembers 20, the inclined shoulders 25- acting as cams to move the studs 1'2 and the outer end of the blade from the position'shown by Fig.

4 to that shown by Figs. 1 and 3.

The lever 21 is here shown as a handoperated tool provided with a handle 29.

It is obvious, however, that said lever may be a fixture on a bench or table, in which case, the springing of the frame will be caused by amovement of the frame rela-,

tively to thelever. .The lever 21 may be engaged with the inner arm 13 instead of with the outer arm, said. inner arm being formed to furnish a seat for said lever and provided with notches 27 and 28, as shown by Fig. 1. When the lever is operated by hand it is preferable to engage it with the inner arm 13 because the operator is enabled to more conveniently apply, and remove the blade using one hand to hold the saw by its handle 30, and the other hand to apply the lever to the inner arm. The lever seat being located on the outer'edgeof one of the frame arms and therefore facin outwardly, and being also located above t e coupling recess of said arm, or in other words, be-

tween said recess and the plane of the back 12, is adapted to engage and-support the lever 21 in either of two positions while it is engaged withthe fulcrum studs on the blade, a movement of the lever in the direction' of the arrow 22 while it is in either position, causing a sufiicient springing of the frame, to separate the positively interlocked frame and blade coupling members from each other. The lever is therefore adapted,-

while engaged with the seat, to tach or secure the blade.

,I claimz- 1. A saw comprising a resilient frame havingslotted arms and recesses formed-iii either de- These ressures' result in a' springing of the rame, the arms be ngeeaerr' the outer edges of said arms, and a blade formed at its end portions to enter the arm slots and having at said portions laterally projecting studs located between its inner and outer edges and adapted to enter said recesses, the said studs a-ndrecesses constia'nd to be separatedby the inward springing of the frame arms, the outer edgeof one tuting complemental coupling members 7 adapted to be held in positively interlocked engagement by the resilience of the frame,

of said. arms being formed'as a'lever seat having provisions for engaging an armspringinglever in either of two positions, and the corresponding studs on the blade said arm and constitute afulcrum to engage; said lever when the latter is in either of said positions, wherebythe lever may be simultaneouslyengaged with the leverseat and fulcrum and caused tospring the arms inpling members.

2. A saw comprising a resilient frame having slot-ted arms and recesses formed-in the oiiter edges of said arms, and a blade formed at its end portions to enter the arm slots and having at said portions laterally projecting studs located between its inner and outer edges and adapted to enter said being formed to project from the sides of wardly either to separate or connect the courecesses, th e said studs and recesses constituting complemental coupling members adapted to be held in positively. interlocked engagement by. the resilience of the frame, and to be separated by the inward springing of. the frame arms, the outer edge of one of said arms being formed as a lever seat having two notches located at different distances from the coupling recess in said arm, and adapted to engage an arm-springing lever in either of two positions, and the studs forming the corresponding coupling mem-' her on the blade being formed to'project outwardly from the opposite sides of said arm and constitute a fulcrum adapted to engage said lever while the latter is engaged with either of said notches, the leverv being simultaneously engageable with one of said notches and the said fulcrum to spring the arms in securing the blade, and with the other notch and the fulcrum to spring the arms in detaching theblade.

3. A saw comprising a resilient frame having'slotted, arms, and a blade formed at its end portions to enter the slots in -said arms, said blade and arms having comple-' mental coupling members adapted tobe held in positively interlocked engagement by the resilience of the frame and to be separated from their interlocked engagement by the inward springing of the frame arms, the outer side of one of the said arms being formed as a lever seat, and the corresponding coupling member on the blade being;

formed as a lever fulcrum, combined with an arm-springing lever adapted to simultaneously engage the said seat and fulcrum and exert pressure thereon to spring the arms inwardl the seat being adaptedto engage said ever in either of two positions whereby the lever may be caused to spring the arms inwardly in either securing or detaching the blade.

4. A saw comprising a resilient frame having slotted arms and recesses formed in tances from the coupling recess in said arm, and adapted to engage an arirrspringing lever in either of two positions, and the studs forming the cor esponding coupling member on the blade being formed to project outwardly from the opposite sides of said arm and constitut: a .t'ulcrun' adapted to engage said lever while the latter is engaged with either of said notches, combined with a lever having a tooth adapted to engage either of said notches, and with two oppositely inclined shoulders located at different distances from said tooth, one of said shoulders being adapted to engage. said fulcrum to detach the blade and the other be ing adaptedlo engage the fulcrum to secure the blade.

In testimony whcreol l have allixed my signature, in presence of two witnesses.

J ()b'l lll-l WOOD. Witnesses (I. F. Bnowx, l. W. PI'Y/ZZEHI. 

